\(3.5^2-27:3^2+5^2.4-18:3^2\)

\(=3.25-27:9+25.4-18:9\)

\(=75-3+100-2\)

\(=72+98\)

\(=170\)

hoi mình ngu  nắm=))))

102, 104

Ta có:

\(\left(x^2-16\right)\left(x+3\right)=0\)

\(\Rightarrow\orbr{\begin{cases}0.\left(x+3\right)=0\\\left(x^2-16\right).0=0\end{cases}}\)

\(\Rightarrow\orbr{\begin{cases}x+3=0\\x^2-16=0\end{cases}}\)

\(\Rightarrow\orbr{\begin{cases}x=0-3\\x^2=0+16\end{cases}}\)

\(\Rightarrow\orbr{\begin{cases}x=\left(-3\right)\\x^2=16\end{cases}}\)

\(\Rightarrow\orbr{\begin{cases}x=\left(-3\right)\\x^2=\left(\pm4\right)^2\end{cases}}\)

\(\Rightarrow\orbr{\begin{cases}x=\left(-3\right)\\x=\left(\pm4\right)\end{cases}}\)

Vậy \(x\in\left\{\pm4;-3\right\}\)

@Nghệ Mạt

#cua

\(x-5.\left(-6\right)=-4.\left(-9\right)\)

\(x-5\left(-6\right)-4\left(-9\right)\)

\(x+30==-4\left(-9\right)\)

\(x+30=36\)

\(x=36-30\)

\(x=6\)

\(7.\left(-8\right)+x=4.\left(-12\right)\)

\(7\left(-8\right)+x=4\left(-12\right)\)

\(-56+x=4\left(-12\right)\)

\(x-56=4\left(-12\right)\)

\(x-56=-48\)

\(x=-48=56\)

\(x=8\)

\(\left(-23\right).\left(-5\right)-x=49.\left(-2\right)\)

\(-23\left(-5\right)-x=49\left(-2\right)\)

\(115-x=49.\left(-2\right)\)

\(-x+115=49.\left(-2\right)\)

\(-x+115=-98\)

\(-x=-98-115\)

\(-x=-213\)

\(x=213\)

quá dễ giốt bằng